Canada will retaliate if U.S. President Donald Trump follows through on his threat to impose 25-per-cent tariffs on imported vehicles and auto parts, with Ottawa prepared to hit American autos with matching levies.

Kirsten Hillman, Canada’s deputy ambassador to the United States, delivered this warning on Thursday at a U.S. Commerce Department hearing in Washington, where U.S. officials were gathering input on Mr. Trump’s proposed tariffs.

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Flavio Volpe, president of the Automotive Parts Manufacturers Association of Canada, said some industry players might balk at Canada retaliating against the United States. But he said Ottawa must fight back. “In these affairs, you’re either a lion or its lunch, and I’m not sure that walking softly will keep you out of its mouth,” he said.